BATTLE PLAN: This British luxury e-commerce group began life as a bricks-and-mortar boutique before flanking its competitors. It spurred a fierce bidding war this year before it was bought by the private equity firm Apax Partners. The group reported record full-year results in 2017, with revenue up 61 percent to £204 million. While still relatively small, its edit of products is second to none, and it is the preferred shopping choice for many fashion industry insiders like Miroslava Duma, Caroline Issa and Livia Firth.

WHAT: MyTheresa.com

HEADQUARTERS: Munich

COMMANDER IN CHIEF: Michael Kliger, president

BATTLE PLAN: Mytheresa.com was set up 10 years ago in the back room of Theresa, a store in Munich. It has long focused on a small high-net-worth customer group scattered across the globe, and today operates websites in German, English, French, Italian, Arabic and Mandarin. In 2014, it was bought by Neiman Marcus, and is known for its capsule collections with luxe brands including Prada, Fendi and Aquazzurra.

Photo

A Céline handbag at the RealReal luxury consignment boutique in SoHo.Credit
Casey Kelbaugh for The New York Times

WHAT: The RealReal

HEADQUARTERS: New York

COMMANDER IN CHIEF: Julie Wainwright, founder and C.E.O.

BATTLE PLAN: Secondhand luxury (often known as the “recommerce market”) is fast becoming big business. The RealReal, an online marketplace that sells pre-owned and authenticated luxury items, was founded by the former Pets.com C.E.O. Julie Wainwright in 2011 and is expected to generate $500 million in revenue for 2017. It has raised $173 million in funding, and last month it opened its first store, in SoHo.

WHAT: Depop

HEADQUARTERS: London

COMMANDERS IN CHIEF: Maria Raga, C.E.O.; Simon Beckerman, founder

BATTLE PLAN: A mobile marketplace that says it has 350,000 active daily users, Depop has been described as “part Instagram and part eBay.” It is particularly popular with teenagers, who like the way users can personalize their digital storefronts. Founded in Milan in 2011, it generates cash by taking a cut of sales on the site. Fashion merchandise, particularly sneakers, dominates sales, and the site has recently undergone a makeover, with the aim of showing off the “attitude” and “confidence” of its buying and selling community.

WHAT: The Modist

HEADQUARTERS: Dubai, United Arab Emirates

COMMANDER IN CHIEF: Ghizlan Guenez, founder

BATTLE PLAN: The so-called modest fashion market is booming, with the global Muslim clothing market forecast to be worth $368 billion by 2021, according to the latest Global Islamic Economy report. The Modist, poised to take advantage of the wave, started earlier this year. But the platform is already generating buzz with its well-chosen selection of pieces from 75 brands including Marni and Alberta Ferretti (think long sleeved tops and maxi skirts or dresses) that prove covered-up fashion can also be elegant and fashion forward.